Turbo-blower.



M. BUTTER.

TURBO BLOWER.

APPLICATION FILED DEC. 24, 1909.

. m R E m N. \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\5 o -m H w W m N .vmE T aw U Hi. V T M v .uov 8+ M W A M mm m I Y E & w 1, a 1 1. w L K0UNITED STATES PATENT OFFICE...

MAX ROTTER, 0F MILWAUKEE, WISCONSIN, ASSIGNOR, BY MESNE ASSIGNMENTS, TOALLIS-CHALMERS MANUFACTURING COMPANY, A CORPORATION OF DELAWARE.

TURBO-BLOWER.

Specification of Letters Patent.

Patented Sept. 22,1914.

Applicationfiled December 24, 1909. Serial No. 534,827.

This invention relates to improvements in the construction of regulatingdevices for turbo-blowers, and in particular to improvements in suchdevices used in connection with blowers furnishing con'ipressed air forblast furnaces or similar nn-poses.

The object of the invention is to provide a means for regulatingturbo-blowers so that the blower will auton'iatically deliver aconstantweight of air irrespective of the dischargepressure. It is oftendesirable, especially in blast furnace work, to have the blower whichfurnishes compressed air deliver an approximately constant weight of airagainst a variablepressure. This has heretofore been accomplished byvarying the suction opening according to the speed of the blower, butthe results thus obtained have not been entirely successful. With thepresent invention, the suction opening is not varied, there being aby-pass through which the superfluous air is returned to an intermediatestage of the blower.

A clear conception of the invention can be obtained by referrin to theaccompanying drawing in which like reference characters designate thesame or similar parts in different views.

Figure 1 is a central vertical section of a turbo-blower built accordingto the in-- vention, showing also the regulator for the prime mover ofthe blower. Fig. 2. is a central vertical section of a' modified form ofpressure control of the by-pass valve.

In the device shownin Fig. 1, the main shaft 1 of the blower, which ispreferably directconnected to the main shaft of the prime mover, notshown, carries a concenoutward to within a short distance from thecaslng of stationary blades 33, 35, 37, mounted thereon and alternatingwith the corre-- sponding sets of rotatable blades 32, 34, 36, thestationary blades 33, 35, 37, extending nwardly from the casing 5, andradially to The casing 5 has a series of sets the spindle 2, to within ashort distance from the spindle 2.

The larger rotatable blades 32 are of about the same length as thestationary blades 33, the blades 32, 33, comprising the first stage ofthe blower. The intermediate rotatable blades 34 are of about the samelength as the stationary blades 35, the blades 34, 35, forming theintermediate stage. The small rotatable blades 36 are of about the samelength as-the stationary blades 3?, alternating therewith, the blades-36, 37, forming the high pressure stage of the blower. It is notnecessary to limit the number of stages in the blower to three, asshown, as any number of stages might exist. A return passage or by-pass29 extends back from the discharge chamber 38 to an annular chamber 30formed around the casing 5, between the first and the intermediatestages of the blower. The nozzles 31 connect the chamber 30 to the spacewithin the blower between the first and intermediate stages thereof. Avalve 28, having the valve stem 24, is located in the connection betweenthe by-pass 29 and the chamber 30.

The stem 24 of the valve 28 has an arm 124 connected thereto having aslotted end 12. This arm 124 is connected at its end 12, by a link 11,to arm 10 of a bell-crank lever, the other arm 9 thereof being slottedat its end. The arm 9 is connected at its slotted end to a slide rod 95guided in a bore in some stationary part 93 of the frame. The rod 95 hastwo lateral extensions 96, taking over the edge of a collar 97 on asleeve 92, screw threaded in the part 93 of the frame for purposes ofadshown, passes through the sleeve 92 and partially carries thebell-crank levers of fly balls 7 at its up er end as usual. Linksconnect the ends 0 the bell-crank levers to the governor collar 8. Aspring 94 sur rounds the shaft 6 above the sleeve 92 and, rests uponsaid sleeve, its upper end abutnot shown. This lever 91 may be floatingfits within the cylinder 221.

and operative upon a relay device such as 1s. common in the art, see forinstance United States atent to Moore, 322,956, July 28, 1885. hegovernor shaft 6 1s connected by bevel gears 3, 4, to; the mam shaft 1.

In the modified form of by-pass and valve arrangement, see Fig. 2, there1s no connection between the governor collar 8 and the by-pass valve281. The thoroughfare through byass 291, connecting the discharge chamer 38 with the annular chamber 301, corresponding to the chamber in thefirst form described, is controlled by the valve 281. The valve 281 hasan arm 241-on its valve stem connected to the end of the piston .rod 253by a slotted head on the arm 241. The piston 251 is fixed to theopposite end of the piston rod 253 and A helical spring 252 coactsagainst the rod side of the iston 251 and against one of the cylindereads. The head end of the cylinder 401 connects with the dischargechamber 38 of the blower through a pipe 402.

:During the o 'eration of the blower the rotary motion 0 the prime moveris transmitted'through the shaft 1 to the spindle 2.

The rotation of the spindle 2 causes the sets.

of rotatable blades 32, 34, 36,120 rotate between adjacent setsofstationary blades 33, 35, 37. This rotation of'the blades 32, 34, 36,causes air to be drawn into the first stage through the suction opening39 and to be forced through the first stage to the-intermediate stage,through the intermediate stage to the high pressure stage, and

I. through the high pressure stage to the discharge chamber 38. Duringthe passage of the air through the various stages. it is graduallycompressed until it is discharged in the chamber 38 at the highestpressure.

As heretofore stated, it is desired to maintain constant the weight ofair compressed per unit of time independent of the pressure to which thecompression extends. In order to increase thepressure of air discharged7 so as to meet new requirements of the fur-- nace necessitatin' higherpressure of air,

-- the speed of the lower must be increased.

is done by adjusting by hand the sleeve 92 downwardly so-as to relievesome of the pressure of spring 94 on the governor col- \lar 8. When thisis done it is also necessary to readjust't'he connection between thelever 91 and the main throttle so as'to afford a wider opening of thethrottle at normal position of governor collar 8 than before if it isdesired to maintain the normal position of'the collar 8 constantfordifierent,

adjustments. This relief of maintain governor collar 8 in normal POSI',

tion. The blower speed will correspondingly be increased and without anyby-pass the weight of air compressed would be increased per unit oftime. I In making this downward adjustment of the sleeve 92, the sliderod 95 is pulled downwardly, operating the linkage to open the valve 28to a set position for the corresponding higher s eed. In this conditionthe blower will sen some of the discharge air back through the by-pass29 and expanding nozzle- '31 to the intermediate stage of the blower asshown, though this return might be made at any point along the blower.This will cause a backing up of pressure at the point of reintroductionand less new air will enter the suction opening 39, to an extentsufiicient to maintain constant'the weight of air compressed per unit oftime. In order to decrease the pressure of air discharged, the reversesequence of operations is made to and does take place. a

In the modification of Fig. 2, the valve 281 will also be automaticallyregulated, but

in this case for any speed of .the blower whether brought about bymanual setting of the governor or by small changes of speed from thenormal speed for which the governor is set. The sleeve 92 having beenset for a higher speed, the higher resulting dis-.

charge pressure will automatically open considering the rotor fixedwhereupon air admitted through the nozzles would create an influx of airat-the suction end of the blower. It will be evident that the by-passcould connect any two points along the blower.

It should beunderstood that it is not desired to be limited to the exactdetails of construction shown and described,- for obvious modificationswill occur to a person skilled in the art. 1 7

It is claimed and desired to secure by Letters Patent,

1. A turbo-blower having a casing, a series of stationary and movableblades within said casing and a by-pass connecting points alongsaid'casing, said connection in-v cluding a nozzle diverging toward theblower outlet.

2. A turbo-blower having a casing, and a by-pass connecting pomts alongsaid casmg, said connection including a nozzle di- 3 sage around stagesof said pump,

pass connecting points along said casing, and means 1n said connectionfor asslstlng in the driving of the rotor of the pump.

' 4. In a multi-stage turbo-blower, the combination of a series ofstages, and a return passage between the delivery of onestage and thedelivery of another stage, said passage being so directed at thedelivery of the preceding stage as to transform the velocity .of thefluid passing throughsaid passage into useful .work blower rotor. 5. Ina multi-stage turbine pump, the combination of a series of stages, areturn pasa prime adjustable to assist in driving the mover for drivingsaid pump,

means for directly-controlling said prime mover, and means cooperatingwith said control means and w1th*sa1d return passage for maintainingconstant the volume of'fluid 2o pumped. V

6. In a-turbo-blower, the combination of a plurality of stages, and aby-pass connecting several of said stages,'said connection in- MAXROTTER' -Witnesses: I G, F. DE WEIN F. E. HAMELTON.

